// triggerHandler() and global events don't bubble or run the default action
if ( onlyHandlers || !elem ) {
event.preventDefault();
event.stopPropagation();
}
onlyHandlers 只在 .triggerHandler用到了，即不触发元素的默认行为，且停止冒泡。
下面是
复制代码 代码如下:
// Handle a global trigger
if ( !elem ) {
// TODO: Stop taunting the data cache; remove global events and always attach to document
jQuery.each( jQuery.cache, function() {
// internalKey variable is just used to make it easier to find
// and potentially change this stuff later; currently it just
// points to jQuery.expando
var internalKey = jQuery.expando,
internalCache = this[ internalKey ];
if ( internalCache && internalCache.events && internalCache.events[ type ] ) {
jQuery.event.trigger( event, data, internalCache.handle.elem );
}
});
return;
}
这里是个递归调用。如果没有传elem元素，那么从jQuery.cache里取。
接着是
复制代码 代码如下:
// Don't do events on text and comment nodes
if ( elem.nodeType === 3 || elem.nodeType === 8 ) {
return;
}
属性，文本节点直接返回。
下面是
复制代码 代码如下:
// Clone any incoming data and prepend the event, creating the handler arg list
data = data != null ? jQuery.makeArray( data ) : [];
data.unshift( event );
先将参数data放入数组，event对象放在数组的第一个位置。
接着是
复制代码 代码如下:
// Fire event on the current element, then bubble up the DOM tree
do {
var handle = jQuery._data( cur, "handle" );
event.currentTarget = cur;
if ( handle ) {
handle.apply( cur, data );
}
// Trigger an inline bound script
if ( ontype && jQuery.acceptData( cur ) && cur[ ontype ] && cur[ ontype ].apply( cur, data ) === false ) {
event.result = false;
event.preventDefault();
}
// Bubble up to document, then to window
cur = cur.parentNode || cur.ownerDocument || cur === event.target.ownerDocument && window;
} while ( cur && !event.isPropagationStopped() );
这段代码很重要，做了以下事情
，取handle
，执行
，执行通过onXXX方式添加的事件（如onclick="fun()"）
，取父元素
while循环不断重复这四步以模拟事件冒泡。直到window对象。
接下是
复制代码 代码如下:
// If nobody prevented the default action, do it now
if ( !event.isDefaultPrevented() ) {
var old,
special = jQuery.event.special[ type ] || {};
if ( (!special._default || special._default.call( elem.ownerDocument, event ) === false) &&
!(type === "click" && jQuery.nodeName( elem, "a" )) && jQuery.acceptData( elem ) ) {
// Call a native DOM method on the target with the same name name as the event.
// Can't use an .isFunction)() check here because IE6/7 fails that test.
// IE<9 dies on focus to hidden element (#1486), may want to revisit a try/catch.
try {
if ( ontype && elem[ type ] ) {
// Don't re-trigger an onFOO event when we call its FOO() method
old = elem[ ontype ];
if ( old ) {
elem[ ontype ] = null;
}
jQuery.event.triggered = type;
elem[ type ]();
}
} catch ( ieError ) {}
if ( old ) {
elem[ ontype ] = old;
}
jQuery.event.triggered = undefined;
}
}
这一段是对于浏览器默认行为的触发。如form.submit()，button.click()等。
注意，由于Firefox中链接的安全性限制，jQuery对链接的默认行为都统一为不能触发。即不能通过.trigger()使链接跳转。
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